JPS6046941A - Preparation of preform for optical fiber - Google Patents
Preparation of preform for optical fiberInfo
- Publication number
- JPS6046941A JPS6046941A JP58154209A JP15420983A JPS6046941A JP S6046941 A JPS6046941 A JP S6046941A JP 58154209 A JP58154209 A JP 58154209A JP 15420983 A JP15420983 A JP 15420983A JP S6046941 A JPS6046941 A JP S6046941A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- raw material
- phosphorus
- sintering
- base material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/10—Non-chemical treatment
- C03B37/12—Non-chemical treatment of fibres or filaments during winding up
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01413—Reactant delivery systems
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
Abstract
Description
【発明の詳細な説明】
本発明は光フアイバー用ガラスプリフォームの製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a glass preform for optical fiber.
（従来技術）
光ファイバーの代表的な製法のなかで火炎加水分解反応
を用いたものとしてＶＡＤ法と外付けＣＶＤ法がある。(Prior Art) Among the typical manufacturing methods for optical fibers, there are the VAD method and the external CVD method, which use a flame hydrolysis reaction.
ＶＡＤ法とは特開昭５６−３３６２７号公報に示される
ようにバーナーから５ＩＣ１！４＋Ｇｅａｌ Ｐ００！
、 ＢＢｒ３ブよとのガラス原料とト】２゜４！
０□なとのガスを同時に流し、ガラス原料を加水分解し
てガラス微粒子を形成し、軸方向に堆坑させながら所定
のドーｌくント分布をもった多孔質ガラス母材を形成し
、Ｉ（θなどの雰囲気中で焼結して透明母材とし、線引
きする方法である。The VAD method is as shown in Japanese Unexamined Patent Publication No. 56-33627, in which 5IC1!4+Geal P00!
, BBr3 buyoto's glass raw material and t】2゜4! 0 □ gas is simultaneously flowed to hydrolyze the glass raw material to form glass fine particles, which are deposited in the axial direction to form a porous glass base material with a predetermined dopant distribution. (This is a method of sintering in an atmosphere such as θ to make a transparent base material, and then drawing a wire.
なお焼結とは多孔質ガラス母材を加熱することにより収
縮させることを言う。Note that sintering refers to shrinking a porous glass base material by heating it.
また外付けＯＶＤ法とは米国特許第３，７３７，２９２
号明細書などに示されるように、火炎加水分解で形成さ
れたガラス微粒子を出発棒の側面に一層ずつ付着させ、
一層毎のドーパント濃度を変えることにより、所定のド
ーパント分布を形成させ、その後出発棒なとり除いて脱
水焼結、線引をおこなう方法である。Also, the external OVD method is described in U.S. Patent No. 3,737,292.
As shown in the specification etc., glass particles formed by flame hydrolysis are attached layer by layer to the side surface of the starting rod,
In this method, a predetermined dopant distribution is formed by changing the dopant concentration in each layer, and then the starting rod is removed, followed by dehydration sintering and wire drawing.
ここで屈折率上昇用ドーパントの一例としてリンが挙げ
られる。例えばＰ２Ｏ５は、屈折率を上昇させるととも
に、その吸湿性によりＯＨ含量を少な（することができ
、より低損失のガラスを得られる。又、石英ガラスの軟
化点を下げて成形加工を容易にする。リンを屈折率を高
めるドーパントとして使った例としては、たとえば特公
昭５（５−２８８５２号公報に、ｖＡＤ法によりＰ２Ｏ
５換算で２重量％のリンを含有した透明母材を製造した
実施例が示されている。（以下。Here, phosphorus is an example of a dopant for increasing the refractive index. For example, P2O5 not only increases the refractive index but also reduces the OH content due to its hygroscopic property, making it possible to obtain a glass with lower loss.It also lowers the softening point of quartz glass, making it easier to form. As an example of using phosphorus as a dopant to increase the refractive index, for example, in Japanese Patent Publication No. 5-28852, P2O
An example is shown in which a transparent matrix containing 2% by weight of phosphorus (calculated as 5%) was produced. (below.
ガラス中のリンの含有量はＰ２Ｏ５換算の重量％とする
。〕
また、特開昭５４−１３４１２８号公報にはリンをＰ２
Ｏ５換算で４重量％含有したプリフォームの例が示され
ているし、米国特許第４．５５９，１７５号明細書につ
いてもリン含有したプリフォームの記述がある。The content of phosphorus in the glass is expressed as weight percent in terms of P2O5. ] Also, in Japanese Patent Application Laid-open No. 54-134128, phosphorus is
An example of a preform containing 4% by weight in terms of O5 is shown, and a preform containing phosphorus is also described in US Pat. No. 4,559,175.
ところで最近、伝送損失の最も小さい１．５５μｍ帯を
使った伝送実験がはじまるにつれて、１．５５μｍ帯の
伝送損失の検討がなされてきた。しかしリンを含んだフ
ァイバでは１．５２μｍ付近にＰ−０−Ｈの吸収が存在
するため、伝送損失が太き（なることが知られている。By the way, as transmission experiments using the 1.55 μm band, which has the smallest transmission loss, have recently begun, transmission loss in the 1.55 μm band has been studied. However, it is known that in a fiber containing phosphorus, P-0-H absorption exists in the vicinity of 1.52 μm, resulting in a large transmission loss.
しかし、 ｖＡＤ法などの、ガラス微粒子から成る多孔
質ガラス母材の焼結工程をともなう光フアイバープリフ
ォームの製法においては、リンをまった（含まない多孔
質ガラス母材を透明化す′るためには、透明化温度が高
いため、高温の焼結炉が必要となり、炉心管、ヒーター
等の寿命や電源保温材の大型化が必要などの点で好まし
くない。この伝送損失を実用上問題にならない程度に押
えるためには、リンの量を５Ｘ１０−３重量％以下にす
る必要があることが本発明者らの研究によりわかった。However, in optical fiber preform manufacturing methods such as the vAD method that involve a sintering process of a porous glass base material made of fine glass particles, phosphorus is added (in order to make the porous glass base material that does not contain phosphorus transparent). Since the transparentization temperature is high, a high-temperature sintering furnace is required, which is undesirable in terms of the lifespan of the furnace core tube, heater, etc., and the need to increase the size of the power insulation material.This transmission loss does not pose a practical problem. Through research conducted by the present inventors, it has been found that in order to suppress the amount of phosphorus to a certain extent, it is necessary to reduce the amount of phosphorus to 5×10 −3% by weight or less.
さらに多孔質ガラス母材の５ち屈折率上昇用ドーパント
であるＧｏ の分布は、堆積温度すなわちスス表面温度
に依存し、このスス表面温度は火炎中のｐｏａｔ、又は
Ｐ２Ｏ５の濃度に依存するので原料中のリンの化合物の
濃度によって制御することができることも本発明者らは
研究途上に見出した。Furthermore, the distribution of Go, which is a dopant for increasing the refractive index of the porous glass base material, depends on the deposition temperature, that is, the soot surface temperature, and this soot surface temperature depends on the concentration of poat or P2O5 in the flame. The present inventors also discovered during the course of their research that the phosphorus content can be controlled by the concentration of the phosphorus compound therein.
したがって、ガラス微粒子を積層させた多孔質ガラス母
材の段階ではリンを含有しておりドーパント分布制御を
容易とし、さらに焼結透明化温度はリンを全（含まない
多孔質ガラス母材より低（透明化を容易にするが、焼結
後線引きして得られたファイバーにおいて゛はリンの含
量が５×１０−３重量％以下であって伝送損失を小さく
した光フアイバー用プリフォームが望ましいものと考え
られる。Therefore, the porous glass base material in which glass fine particles are laminated contains phosphorus, making it easy to control the dopant distribution, and the sintering transparency temperature is lower than that of the porous glass base material that does not contain all phosphorus. It is considered desirable to use an optical fiber preform with a phosphorus content of 5 x 10-3% by weight or less and a low transmission loss in the fiber obtained by drawing after sintering to facilitate transparency. It will be done.
（発明の目的）
本発明者は以上の困難を克服すべく努力した結果多孔質
ガラス母体の段階ではリンをドープするが、焼結の段階
ではリンを揮散させて、得られた透明母材のす／の含有
量を５×１０ 重量％以下にする本発明の方法に到達し
た。(Purpose of the Invention) As a result of efforts made by the present inventor to overcome the above-mentioned difficulties, the present inventor doped phosphorus at the stage of forming a porous glass matrix, but evaporated the phosphorus at the stage of sintering. The method of the present invention has been achieved in which the content of S/ is 5 x 10% by weight or less.
（発明の構成）
本発明の要旨は
（１） ガラス用原料および燃焼ガスをバーナーより噴
出せしめ、該ガラス原料を燃焼ガス中で火炎加水分解し
、ガラス微粒子を積層させて多孔質ガラス母材となし、
これを焼結透明化し、光フアイバ用プリフォームを製造
する方法において、該ガラス原料にリンの化合物を加え
、そして得られる多孔質ガラス母材の焼結時にリン分を
揮散させることを特徴とする上記方法。(Structure of the Invention) The gist of the present invention is (1) A raw material for glass and a combustion gas are ejected from a burner, the raw material for glass is flame-hydrolyzed in the combustion gas, and glass fine particles are laminated to form a porous glass base material. none,
A method for producing an optical fiber preform by sintering and making it transparent is characterized by adding a phosphorus compound to the glass raw material and volatilizing the phosphorus content during sintering of the obtained porous glass base material. The above method.
（２） ガラス原料に加えるリンの化合物の全ガラス原
料中に占める割合を０．０１〜１モル％とし、得られた
多孔質ガラス母材の焼結透明化時におけるＨｅ 流量を
１石／分以上とすることを特徴とする特許請求の範囲第
１項記載の光ファイバの製造方法。(2) The proportion of the phosphorus compound added to the glass raw material in the total glass raw material is 0.01 to 1 mol%, and the He flow rate during sintering and transparency of the obtained porous glass base material is 1 stone/min. A method for manufacturing an optical fiber according to claim 1, characterized in that the method is as follows.
（３） 多孔質ガラス母材の焼結時にリン分を揮散させ
て得られるプリフォーム中のリン含量を５ Ｘ １０−
’重量％以下とすることを特徴とする特許請求の範囲第
１項又は第２項記戦の方法。(3) The phosphorus content in the preform obtained by volatilizing the phosphorus content during sintering of the porous glass base material is 5 x 10-
% by weight or less.
ところにある。There it is.
透明母材中のリン含有量を小さくするためには、■多孔
質ガラス体製造工程で添加するリン用原料ガス供給量を
小さくする。■焼結工程において雰囲気のガス流量を一
足以上にし、多孔質ガラス体から揮散するリン化合物を
炉外へとり除く、という２つの方法がある。In order to reduce the phosphorus content in the transparent base material, (1) reduce the supply amount of the raw material gas for phosphorus added in the porous glass body manufacturing process; (2) There are two methods: increasing the gas flow rate in the atmosphere to more than one foot in the sintering process and removing phosphorus compounds volatilized from the porous glass body to the outside of the furnace.
■の方法では上述したようなリンによるドーパント分布
制御および、焼結温度を下げる効果が期待できな（なる
。そこで本発明者らは■の方法について以下のように検
討した。The method (2) cannot be expected to control the dopant distribution using phosphorus and reduce the sintering temperature as described above. Therefore, the present inventors investigated the method (2) as follows.
本発明者は、原料のＰａｃｅ３の供給量と焼結工程での
Ｈｅ 流量、透明化後の透明母材の中のＰ２Ｏ５の含有
量の関係を調べるため、バーナーへ供給する原料中のリ
ンの量を変えた数本の多孔質ガラス体を試作し、これを
Ｈｅの流量Ｏｌ、１１３．５４３．２０１３の４条件で
焼結し、得られた透明母材を分析、Ｐ２Ｏ５の量を定量
した。In order to investigate the relationship between the supply amount of raw material Pace 3, the He flow rate in the sintering process, and the content of P2O5 in the transparent base material after transparentization, the present inventor investigated the amount of phosphorus in the raw material supplied to the burner. Several porous glass bodies with different values were prototyped and sintered under four conditions: He flow rate O1, 113.543.2013, and the resulting transparent base material was analyzed to quantify the amount of P2O5.
第１図は実験の結果をグラフに示したもので、横軸には
バーナ１本当りの全ガラス原料中のＰＯＯ／３の含有率
（モル％）を示し縦軸には透明化後のガラス中のＰ２Ｏ
５含有率を示す。Figure 1 shows the results of the experiment in a graph, where the horizontal axis shows the content (mol%) of POO/3 in the total glass raw material per burner, and the vertical axis shows the glass after transparentization. P2O inside
5 content.
このグラフから判明したことはリンの含有量を５Ｘ１０
’ｗｔ％ 以下にするためには焼結時の【（θ 光景０
石／分の場合、原料ガス中のＰＯＣ１！３をｏ、ｏ ｏ
ｓモル％以下にする必要があるが、この上限値は焼結
時のｆ（ｅ流量を上げることにより増加させることがで
きる。即ちＨｅ量５Ａ／分では５ Ｘ １０””モル％
、２０石／分では１モル％となる。またリンの流量が全
ガラス原料ガス中の０．０１モル％以下であれば、多孔
質母体形成時の温度制御が困難になるばかりでな（、焼
結においても１７００℃以上の高温が必要となり、炉心
管などの寿命が短か（なる。一方Ｈθを２０ｐ／分以上
流すことはコスト上極めて困難である。なおリン用原料
としてｐｏａｔ、を示したがＰ］／３． ｐｃｉ５など
他のリン化合物を原料としてもよい。What we found from this graph is that the phosphorus content was 5X10
'wt% or less, during sintering [(θ sight 0
In the case of stone/min, POC1!3 in the raw material gas is o, o o
s mol% or less, but this upper limit can be increased by increasing the flow rate of f(e) during sintering. In other words, at a He amount of 5 A/min, 5 x 10"" mol%
, it becomes 1 mol% at 20 stones/min. Furthermore, if the flow rate of phosphorus is less than 0.01 mol% of the total frit gas, it will not only be difficult to control the temperature during the formation of the porous matrix (also, high temperatures of 1700°C or higher will be required for sintering). , the life of the reactor core tube etc. will be short (this will be the case.On the other hand, it is extremely difficult to flow Hθ over 20 p/min due to cost.Poat is shown as the raw material for phosphorus, but P]/3. Other phosphorus such as pci5) A compound may be used as a raw material.
以上の条件はシングルモードファイバ用多孔質ガラス母
材の場合でも適用される。シングルモードファイバ用多
孔質ガラス母材の場合はＰの添加は焼結を容易にするば
かりでな（、スス付中のスス表面温度分布を均一にしか
さ密度を均一にして多孔質ガラス母材のわれ率を下げる
効果がある。The above conditions also apply to the porous glass base material for single mode fiber. In the case of a porous glass base material for single-mode fibers, the addition of P not only makes sintering easier (but also makes the soot surface temperature distribution uniform during soot application, and makes the soot density uniform). It has the effect of lowering the share ratio.
実施例−１
ＶＡＤ法において１本の同心円状多重管）（−ナーを使
い、マルチモードコアイノく用多孔質ガラス母材を製造
し次にこれを焼結炉で透明化した。Example 1 A porous glass base material for a multi-mode core was produced using a VAD method using a concentric multi-tube (-ner), and then it was made transparent in a sintering furnace.
多孔質ガラス母体形成時の原料流量および焼結条件を第
１表に示す。なお以下に述べる原料およびＨｅの流量は
標準状態（０℃、１気圧）における値である。Table 1 shows the raw material flow rate and sintering conditions during the formation of the porous glass matrix. Note that the flow rates of raw materials and He described below are values under standard conditions (0° C., 1 atm).
第１表
透明化後のリンの含有量を測定したところ７×１０−４
％であった。得られたファイバーのΔｎ−１％、コア径
は５０μｍ、ファイバー外径は１２５μｍであり、その
伝送損失波長曲線を第２図に示す。第２図からあきらか
なよ５に１．５２μｍ付近のＰ−０−Ｈの吸収は認めら
れない。Table 1: Measuring the phosphorus content after clearing: 7 x 10-4
%Met. The obtained fiber had a Δn-1%, a core diameter of 50 μm, and a fiber outer diameter of 125 μm, and its transmission loss wavelength curve is shown in FIG. It is clear from FIG. 2 that no absorption of P-0-H in the vicinity of 1.52 μm is observed.
実施例−２ ＶＡＤ法において多重管バーナーを３本使い。Example-2 Three multi-tube burners are used in the VAD method.
シングルモードファイバ用多孔質ガラス１せ材を製造し
た。１本はコア用バーナーであり残りの２本はクラッド
用バーナーである。多孔質ガラス母材形成時の原料流量
および焼結条件を第２表に示す。また得られたファイバ
ーの伝送損失波長曲線を第５囚に示す。A porous glass laminated material for single mode fiber was manufactured. One burner is for the core and the remaining two are burners for the cladding. Table 2 shows the raw material flow rate and sintering conditions during the formation of the porous glass base material. Furthermore, the transmission loss wavelength curve of the obtained fiber is shown in Figure 5.
第２表
透明ガラス化後のリンの含有量を分析したところ２Ｘ１
０ｗｔ％ であった。得られたファイバーのコア径は８
．５μｍ、Δｎ＝０．２７％、ファイバー外径は１２５
μｍであり、第３図に示すように１．５２μｍ付近にお
けるＰ−ＯＨの吸収は認められない。Table 2 Analysis of phosphorus content after transparent vitrification 2X1
It was 0wt%. The core diameter of the obtained fiber was 8
．． 5μm, Δn=0.27%, fiber outer diameter is 125
.mu.m, and as shown in FIG. 3, no absorption of P-OH is observed in the vicinity of 1.52 .mu.m.
なお実施例１，２においては焼結温度が１６００℃の場
合について述べているが、リンの揮散は多孔質ガラス母
体が室温から最高温度の１６００℃に昇温する過程でお
こり、焼結温度とはその最高温度を示すものでリンの揮
散温度ではない。In addition, in Examples 1 and 2, the case where the sintering temperature is 1600°C is described, but the volatilization of phosphorus occurs during the process of heating the porous glass matrix from room temperature to the maximum temperature of 1600°C, and the sintering temperature and indicates the maximum temperature, not the volatilization temperature of phosphorus.
（発明の効果）
以上の実施例からも明らかなように本発明の方法によれ
ば、多孔質ガラス母材製造工程においてはドーパント分
布制御を容易にしかつ焼結温度を下げる効果のあるリン
を原料中に添加しておいて、透明化時に上記の添加した
リンを揮散させ、最終的には透明母材中のリンを低減さ
せるので、１．５２μｍ付近での伝送損失の少なりｉ７
フイバー用プリフォームを製造することができる。(Effects of the Invention) As is clear from the above examples, according to the method of the present invention, phosphorus, which is effective in facilitating dopant distribution control and lowering the sintering temperature, is used as a raw material in the porous glass base material manufacturing process. The added phosphorus is volatilized during transparentization, and the phosphorus in the transparent base material is finally reduced, resulting in less transmission loss around 1.52 μm.
Preforms for fibers can be manufactured.
第１図はガラス原料中のｐｏｃｚ６含有率とＨｅ流量を
変えることによるガラス中のＰ２Ｏ５含有率の変化を示
すグラフであり、第２図および第３図はそれぞれ実施例
１および２で得られた光ファイバーの伝送損失波長曲線
を示す図である。
代理人 内 １） 明
代理人 萩 原 亮 −Figure 1 is a graph showing the change in the P2O5 content in the glass by changing the pocz6 content in the glass raw material and the He flow rate, and Figures 2 and 3 are graphs showing the changes in the P2O5 content in the glass obtained in Examples 1 and 2, respectively. FIG. 3 is a diagram showing a transmission loss wavelength curve of an optical fiber. Agents 1) Akira’s agent Ryo Hagiwara −
Claims (3)
出せしめ、該ガラス原料を燃焼ガス中で火炎加水分解し
、ガラス微粒子を積層させて多孔質ガラス母材となし、
これを焼結透明化し、光フアイバー用プリフォームを製
造する方法において、該ガラス原料にリンの化合物を加
え、そして得られる多孔質ガラス母材の焼結時にリン分
を揮散させることを特徴とする上記方法。(1) A raw material for glass and a combustion gas are ejected from a burner, the raw material for glass is flame-hydrolyzed in the combustion gas, and glass fine particles are laminated to form a porous glass base material,
A method for manufacturing an optical fiber preform by sintering and making it transparent is characterized by adding a phosphorus compound to the glass raw material and volatilizing the phosphorus content during sintering of the obtained porous glass base material. The above method.
原料中に占める割合を０．０１〜１モル％とし、得られ
た多孔質ガラス母材の焼結透明化時におけろＨｅ流量を
１１／分以上とすることを特徴とする特許請求の範囲第
１項記載の光ファイバの製造方法。(2) The proportion of the phosphorus compound in the glass raw material in the total glass raw material is set to 0.01 to 1 mol%, and the He flow rate during sintering and transparency of the obtained porous glass base material is set to 11%. 2. The method of manufacturing an optical fiber according to claim 1, wherein the manufacturing time is at least 1/min.
て、得られるプリフォーム中のリン含量を５ Ｘ １０
−３重量％以下とすることを特徴とする特許請求の範囲
第１項又は第２項記載の方法。(3) Volatize the phosphorus content during sintering of the porous glass base material, and reduce the phosphorus content in the resulting preform to 5 x 10
-3% by weight or less, the method according to claim 1 or 2.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58154209A JPS6046941A (en) | 1983-08-25 | 1983-08-25 | Preparation of preform for optical fiber |
| KR1019840004791A KR870000383B1 (en) | 1983-08-25 | 1984-08-10 | Preparation for making of fiber glass preform |
| EP84110123A EP0135175B1 (en) | 1983-08-25 | 1984-08-24 | Methods for producing optical fiber preform and optical fiber |
| CA000461756A CA1233709A (en) | 1983-08-25 | 1984-08-24 | Methods for producing optical fiber preform and optical fiber |
| AU32354/84A AU563400B2 (en) | 1983-08-25 | 1984-08-24 | Optical fibre preform manufacture |
| DE8484110123T DE3478680D1 (en) | 1983-08-25 | 1984-08-24 | Methods for producing optical fiber preform and optical fiber |
| US07/097,320 US4804393A (en) | 1983-08-25 | 1987-09-11 | Methods for producing optical fiber preform and optical fiber |
| HK1019/89A HK101989A (en) | 1983-08-25 | 1989-12-21 | Methods for producing optical fiber preform and optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58154209A JPS6046941A (en) | 1983-08-25 | 1983-08-25 | Preparation of preform for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6046941A true JPS6046941A (en) | 1985-03-14 |
| JPH0359018B2 JPH0359018B2 (en) | 1991-09-09 |
Family
ID=15579227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58154209A Granted JPS6046941A (en) | 1983-08-25 | 1983-08-25 | Preparation of preform for optical fiber |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4804393A (en) |
| EP (1) | EP0135175B1 (en) |
| JP (1) | JPS6046941A (en) |
| KR (1) | KR870000383B1 (en) |
| AU (1) | AU563400B2 (en) |
| CA (1) | CA1233709A (en) |
| DE (1) | DE3478680D1 (en) |
| HK (1) | HK101989A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2839063B1 (en) * | 2002-04-29 | 2005-01-07 | Cit Alcatel | PROCESS FOR PRODUCING OPTICAL FIBER PREFORMS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57209839A (en) * | 1981-06-16 | 1982-12-23 | Nippon Telegr & Teleph Corp <Ntt> | Manufacturing of optical fiber |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52121341A (en) * | 1976-04-06 | 1977-10-12 | Nippon Telegr & Teleph Corp <Ntt> | Production of optical fiber base materials and production apparatus fo r the same |
| JPS5927728B2 (en) * | 1977-08-11 | 1984-07-07 | 日本電信電話株式会社 | Manufacturing method of sooty glass rod |
| JPS54134128A (en) * | 1978-04-04 | 1979-10-18 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of basic material for light transmitting fiber |
| JPS54131044A (en) * | 1978-04-04 | 1979-10-11 | Nippon Telegr & Teleph Corp <Ntt> | Production of parent material for optical communication fiber |
| US4242118A (en) * | 1979-04-27 | 1980-12-30 | International Standard Electric Corporation | Optical fiber manufacture |
| JPS565339A (en) * | 1979-06-26 | 1981-01-20 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of high purity quartz glass |
| JPS599491B2 (en) * | 1979-07-20 | 1984-03-02 | 日本電信電話株式会社 | Method for manufacturing base material for optical fiber |
| US4345928A (en) * | 1979-10-09 | 1982-08-24 | Nippon Telegraph & Telephone Public Corporation | Fabrication method of single-mode optical fiber preforms |
| US4385802A (en) * | 1980-06-09 | 1983-05-31 | Corning Glass Works | Long wavelength, low-loss optical waveguide |
| US4298365A (en) * | 1980-07-03 | 1981-11-03 | Corning Glass Works | Method of making a soot preform compositional profile |
| US4304581A (en) * | 1980-08-07 | 1981-12-08 | Western Electric Co., Inc. | Lightguide preform fabrication |
| JPS5792534A (en) * | 1980-11-28 | 1982-06-09 | Nippon Telegr & Teleph Corp <Ntt> | Elongation of glass rod |
-
1983
- 1983-08-25 JP JP58154209A patent/JPS6046941A/en active Granted
-
1984
- 1984-08-10 KR KR1019840004791A patent/KR870000383B1/en not_active IP Right Cessation
- 1984-08-24 CA CA000461756A patent/CA1233709A/en not_active Expired
- 1984-08-24 EP EP84110123A patent/EP0135175B1/en not_active Expired
- 1984-08-24 DE DE8484110123T patent/DE3478680D1/en not_active Expired
- 1984-08-24 AU AU32354/84A patent/AU563400B2/en not_active Ceased
-
1987
- 1987-09-11 US US07/097,320 patent/US4804393A/en not_active Expired - Lifetime
-
1989
- 1989-12-21 HK HK1019/89A patent/HK101989A/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57209839A (en) * | 1981-06-16 | 1982-12-23 | Nippon Telegr & Teleph Corp <Ntt> | Manufacturing of optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| US4804393A (en) | 1989-02-14 |
| KR850001510A (en) | 1985-03-30 |
| CA1233709A (en) | 1988-03-08 |
| JPH0359018B2 (en) | 1991-09-09 |
| KR870000383B1 (en) | 1987-03-07 |
| AU563400B2 (en) | 1987-07-09 |
| EP0135175A1 (en) | 1985-03-27 |
| HK101989A (en) | 1989-12-29 |
| EP0135175B1 (en) | 1989-06-14 |
| DE3478680D1 (en) | 1989-07-20 |
| AU3235484A (en) | 1985-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4610709A (en) | Method for producing glass preform for optical fiber | |
| JPS6124348B2 (en) | ||
| JP2004530621A (en) | Method for producing optical waveguide article having high fluorine content region | |
| JPS60257408A (en) | Optical fiber and its production | |
| US4161505A (en) | Process for producing optical transmission fiber | |
| US4295869A (en) | Process for producing optical transmission fiber | |
| JP2017007941A (en) | Production method of glass preform | |
| JPS647015B2 (en) | ||
| US4165152A (en) | Process for producing optical transmission fiber | |
| JPH0380740B2 (en) | ||
| EP0164103A2 (en) | Method for producing glass preform for optical fiber containing fluorine in cladding | |
| US4298366A (en) | Graded start rods for the production of optical waveguides | |
| GB2029400A (en) | An Optical Fibre | |
| JPS6046941A (en) | Preparation of preform for optical fiber | |
| JPH0525818B2 (en) | ||
| JPH0463365B2 (en) | ||
| JPH0551542B2 (en) | ||
| KR830002121B1 (en) | Optical fiber | |
| JPS5910938B2 (en) | Method of manufacturing optical transmission glass | |
| JPS60145927A (en) | Production of base material for optical fiber | |
| JPH0791082B2 (en) | Method and apparatus for manufacturing optical fiber preform | |
| JPH03115136A (en) | Optical fiber preform and its production | |
| JPH0518768B2 (en) | ||
| JPH0314787B2 (en) | ||
| JPS623774B2 (en) |